How do I Disable a Sound Device when Window 7 Won't Let Me?

[gofraidh34]

I want to disconnect/disable Communications Headphones but Window 7 won't let me. Both the Speaker/Headphones and Communications Headphones share the same port/panel (Front panel) and I use it for my speaker since I bought my monitor w/o knowing it doesn't have sound in it. I have tried to do these following:
- right click and disable
- Set Default Speakers/Headphones
- right click > Properties > Advance > uncheck "Allow applications to take exclusive..."
When I click apply and Ok My computer changes back to how it originally was (checked)

Whenever I am watching a youtube video for example it sometimes changes the output of my videos to Communications Headphones and I can't change it back until some random amount of time.